How to ensure Crinum Lily blooms?

In spring of 2013, I dug up crinum lily bulbs from a friend who had no blooms due to shade. They are in pots in greenhouse, watered every day, but have never bloomed. I am planting some in the ground and adding more water. Do they like to be crowded or more space? Any other advice to get blooms so that I can finally see what color they are?